Mercurial > hg > truffle
annotate src/share/vm/memory/allocation.hpp @ 3450:3275a6560cf7
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Reviewed-by: iveresov, never
author | twisti |
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date | Tue, 14 Jun 2011 12:25:05 -0700 |
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0 | 1 /* |
2250 | 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_MEMORY_ALLOCATION_HPP |
26 #define SHARE_VM_MEMORY_ALLOCATION_HPP | |
27 | |
28 #include "runtime/globals.hpp" | |
29 #include "utilities/globalDefinitions.hpp" | |
30 #ifdef COMPILER1 | |
31 #include "c1/c1_globals.hpp" | |
32 #endif | |
33 #ifdef COMPILER2 | |
34 #include "opto/c2_globals.hpp" | |
35 #endif | |
36 | |
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37 #include <new> |
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38 |
0 | 39 #define ARENA_ALIGN_M1 (((size_t)(ARENA_AMALLOC_ALIGNMENT)) - 1) |
40 #define ARENA_ALIGN_MASK (~((size_t)ARENA_ALIGN_M1)) | |
41 #define ARENA_ALIGN(x) ((((size_t)(x)) + ARENA_ALIGN_M1) & ARENA_ALIGN_MASK) | |
42 | |
43 // All classes in the virtual machine must be subclassed | |
44 // by one of the following allocation classes: | |
45 // | |
46 // For objects allocated in the resource area (see resourceArea.hpp). | |
47 // - ResourceObj | |
48 // | |
49 // For objects allocated in the C-heap (managed by: free & malloc). | |
50 // - CHeapObj | |
51 // | |
52 // For objects allocated on the stack. | |
53 // - StackObj | |
54 // | |
55 // For embedded objects. | |
56 // - ValueObj | |
57 // | |
58 // For classes used as name spaces. | |
59 // - AllStatic | |
60 // | |
61 // The printable subclasses are used for debugging and define virtual | |
62 // member functions for printing. Classes that avoid allocating the | |
63 // vtbl entries in the objects should therefore not be the printable | |
64 // subclasses. | |
65 // | |
66 // The following macros and function should be used to allocate memory | |
67 // directly in the resource area or in the C-heap: | |
68 // | |
69 // NEW_RESOURCE_ARRAY(type,size) | |
70 // NEW_RESOURCE_OBJ(type) | |
71 // NEW_C_HEAP_ARRAY(type,size) | |
72 // NEW_C_HEAP_OBJ(type) | |
73 // char* AllocateHeap(size_t size, const char* name); | |
74 // void FreeHeap(void* p); | |
75 // | |
76 // C-heap allocation can be traced using +PrintHeapAllocation. | |
77 // malloc and free should therefore never called directly. | |
78 | |
79 // Base class for objects allocated in the C-heap. | |
80 | |
81 // In non product mode we introduce a super class for all allocation classes | |
82 // that supports printing. | |
83 // We avoid the superclass in product mode since some C++ compilers add | |
84 // a word overhead for empty super classes. | |
85 | |
86 #ifdef PRODUCT | |
87 #define ALLOCATION_SUPER_CLASS_SPEC | |
88 #else | |
89 #define ALLOCATION_SUPER_CLASS_SPEC : public AllocatedObj | |
90 class AllocatedObj { | |
91 public: | |
92 // Printing support | |
93 void print() const; | |
94 void print_value() const; | |
95 | |
96 virtual void print_on(outputStream* st) const; | |
97 virtual void print_value_on(outputStream* st) const; | |
98 }; | |
99 #endif | |
100 | |
101 class CHeapObj ALLOCATION_SUPER_CLASS_SPEC { | |
102 public: | |
103 void* operator new(size_t size); | |
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104 void* operator new (size_t size, const std::nothrow_t& nothrow_constant); |
0 | 105 void operator delete(void* p); |
106 void* new_array(size_t size); | |
107 }; | |
108 | |
109 // Base class for objects allocated on the stack only. | |
110 // Calling new or delete will result in fatal error. | |
111 | |
112 class StackObj ALLOCATION_SUPER_CLASS_SPEC { | |
113 public: | |
114 void* operator new(size_t size); | |
115 void operator delete(void* p); | |
116 }; | |
117 | |
118 // Base class for objects used as value objects. | |
119 // Calling new or delete will result in fatal error. | |
120 // | |
121 // Portability note: Certain compilers (e.g. gcc) will | |
122 // always make classes bigger if it has a superclass, even | |
123 // if the superclass does not have any virtual methods or | |
124 // instance fields. The HotSpot implementation relies on this | |
125 // not to happen. So never make a ValueObj class a direct subclass | |
126 // of this object, but use the VALUE_OBJ_CLASS_SPEC class instead, e.g., | |
127 // like this: | |
128 // | |
129 // class A VALUE_OBJ_CLASS_SPEC { | |
130 // ... | |
131 // } | |
132 // | |
133 // With gcc and possible other compilers the VALUE_OBJ_CLASS_SPEC can | |
134 // be defined as a an empty string "". | |
135 // | |
136 class _ValueObj { | |
137 public: | |
138 void* operator new(size_t size); | |
139 void operator delete(void* p); | |
140 }; | |
141 | |
142 // Base class for classes that constitute name spaces. | |
143 | |
144 class AllStatic { | |
145 public: | |
146 AllStatic() { ShouldNotCallThis(); } | |
147 ~AllStatic() { ShouldNotCallThis(); } | |
148 }; | |
149 | |
150 | |
151 //------------------------------Chunk------------------------------------------ | |
152 // Linked list of raw memory chunks | |
153 class Chunk: public CHeapObj { | |
154 protected: | |
155 Chunk* _next; // Next Chunk in list | |
156 const size_t _len; // Size of this Chunk | |
157 public: | |
158 void* operator new(size_t size, size_t length); | |
159 void operator delete(void* p); | |
160 Chunk(size_t length); | |
161 | |
162 enum { | |
163 // default sizes; make them slightly smaller than 2**k to guard against | |
164 // buddy-system style malloc implementations | |
165 #ifdef _LP64 | |
166 slack = 40, // [RGV] Not sure if this is right, but make it | |
167 // a multiple of 8. | |
168 #else | |
169 slack = 20, // suspected sizeof(Chunk) + internal malloc headers | |
170 #endif | |
171 | |
172 init_size = 1*K - slack, // Size of first chunk | |
173 medium_size= 10*K - slack, // Size of medium-sized chunk | |
174 size = 32*K - slack, // Default size of an Arena chunk (following the first) | |
175 non_pool_size = init_size + 32 // An initial size which is not one of above | |
176 }; | |
177 | |
178 void chop(); // Chop this chunk | |
179 void next_chop(); // Chop next chunk | |
180 static size_t aligned_overhead_size(void) { return ARENA_ALIGN(sizeof(Chunk)); } | |
181 | |
182 size_t length() const { return _len; } | |
183 Chunk* next() const { return _next; } | |
184 void set_next(Chunk* n) { _next = n; } | |
185 // Boundaries of data area (possibly unused) | |
186 char* bottom() const { return ((char*) this) + aligned_overhead_size(); } | |
187 char* top() const { return bottom() + _len; } | |
188 bool contains(char* p) const { return bottom() <= p && p <= top(); } | |
189 | |
190 // Start the chunk_pool cleaner task | |
191 static void start_chunk_pool_cleaner_task(); | |
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192 |
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193 static void clean_chunk_pool(); |
0 | 194 }; |
195 | |
196 //------------------------------Arena------------------------------------------ | |
197 // Fast allocation of memory | |
198 class Arena: public CHeapObj { | |
199 protected: | |
200 friend class ResourceMark; | |
201 friend class HandleMark; | |
202 friend class NoHandleMark; | |
203 Chunk *_first; // First chunk | |
204 Chunk *_chunk; // current chunk | |
205 char *_hwm, *_max; // High water mark and max in current chunk | |
206 void* grow(size_t x); // Get a new Chunk of at least size x | |
207 NOT_PRODUCT(size_t _size_in_bytes;) // Size of arena (used for memory usage tracing) | |
2250 | 208 NOT_PRODUCT(static julong _bytes_allocated;) // total #bytes allocated since start |
0 | 209 friend class AllocStats; |
210 debug_only(void* malloc(size_t size);) | |
211 debug_only(void* internal_malloc_4(size_t x);) | |
2250 | 212 NOT_PRODUCT(void inc_bytes_allocated(size_t x);) |
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213 |
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214 void signal_out_of_memory(size_t request, const char* whence) const; |
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215 |
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216 void check_for_overflow(size_t request, const char* whence) const { |
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217 if (UINTPTR_MAX - request < (uintptr_t)_hwm) { |
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218 signal_out_of_memory(request, whence); |
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219 } |
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220 } |
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221 |
0 | 222 public: |
223 Arena(); | |
224 Arena(size_t init_size); | |
225 Arena(Arena *old); | |
226 ~Arena(); | |
227 void destruct_contents(); | |
228 char* hwm() const { return _hwm; } | |
229 | |
230 // Fast allocate in the arena. Common case is: pointer test + increment. | |
231 void* Amalloc(size_t x) { | |
232 assert(is_power_of_2(ARENA_AMALLOC_ALIGNMENT) , "should be a power of 2"); | |
233 x = ARENA_ALIGN(x); | |
234 debug_only(if (UseMallocOnly) return malloc(x);) | |
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235 check_for_overflow(x, "Arena::Amalloc"); |
2250 | 236 NOT_PRODUCT(inc_bytes_allocated(x);) |
0 | 237 if (_hwm + x > _max) { |
238 return grow(x); | |
239 } else { | |
240 char *old = _hwm; | |
241 _hwm += x; | |
242 return old; | |
243 } | |
244 } | |
245 // Further assume size is padded out to words | |
246 void *Amalloc_4(size_t x) { | |
247 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); | |
248 debug_only(if (UseMallocOnly) return malloc(x);) | |
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249 check_for_overflow(x, "Arena::Amalloc_4"); |
2250 | 250 NOT_PRODUCT(inc_bytes_allocated(x);) |
0 | 251 if (_hwm + x > _max) { |
252 return grow(x); | |
253 } else { | |
254 char *old = _hwm; | |
255 _hwm += x; | |
256 return old; | |
257 } | |
258 } | |
259 | |
260 // Allocate with 'double' alignment. It is 8 bytes on sparc. | |
261 // In other cases Amalloc_D() should be the same as Amalloc_4(). | |
262 void* Amalloc_D(size_t x) { | |
263 assert( (x&(sizeof(char*)-1)) == 0, "misaligned size" ); | |
264 debug_only(if (UseMallocOnly) return malloc(x);) | |
265 #if defined(SPARC) && !defined(_LP64) | |
266 #define DALIGN_M1 7 | |
267 size_t delta = (((size_t)_hwm + DALIGN_M1) & ~DALIGN_M1) - (size_t)_hwm; | |
268 x += delta; | |
269 #endif | |
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270 check_for_overflow(x, "Arena::Amalloc_D"); |
2250 | 271 NOT_PRODUCT(inc_bytes_allocated(x);) |
0 | 272 if (_hwm + x > _max) { |
273 return grow(x); // grow() returns a result aligned >= 8 bytes. | |
274 } else { | |
275 char *old = _hwm; | |
276 _hwm += x; | |
277 #if defined(SPARC) && !defined(_LP64) | |
278 old += delta; // align to 8-bytes | |
279 #endif | |
280 return old; | |
281 } | |
282 } | |
283 | |
284 // Fast delete in area. Common case is: NOP (except for storage reclaimed) | |
285 void Afree(void *ptr, size_t size) { | |
286 #ifdef ASSERT | |
287 if (ZapResourceArea) memset(ptr, badResourceValue, size); // zap freed memory | |
288 if (UseMallocOnly) return; | |
289 #endif | |
290 if (((char*)ptr) + size == _hwm) _hwm = (char*)ptr; | |
291 } | |
292 | |
293 void *Arealloc( void *old_ptr, size_t old_size, size_t new_size ); | |
294 | |
295 // Move contents of this arena into an empty arena | |
296 Arena *move_contents(Arena *empty_arena); | |
297 | |
298 // Determine if pointer belongs to this Arena or not. | |
299 bool contains( const void *ptr ) const; | |
300 | |
301 // Total of all chunks in use (not thread-safe) | |
302 size_t used() const; | |
303 | |
304 // Total # of bytes used | |
305 size_t size_in_bytes() const NOT_PRODUCT({ return _size_in_bytes; }) PRODUCT_RETURN0; | |
306 void set_size_in_bytes(size_t size) NOT_PRODUCT({ _size_in_bytes = size; }) PRODUCT_RETURN; | |
307 static void free_malloced_objects(Chunk* chunk, char* hwm, char* max, char* hwm2) PRODUCT_RETURN; | |
308 static void free_all(char** start, char** end) PRODUCT_RETURN; | |
309 | |
310 private: | |
311 // Reset this Arena to empty, access will trigger grow if necessary | |
312 void reset(void) { | |
313 _first = _chunk = NULL; | |
314 _hwm = _max = NULL; | |
315 } | |
316 }; | |
317 | |
318 // One of the following macros must be used when allocating | |
319 // an array or object from an arena | |
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320 #define NEW_ARENA_ARRAY(arena, type, size) \ |
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321 (type*) (arena)->Amalloc((size) * sizeof(type)) |
0 | 322 |
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323 #define REALLOC_ARENA_ARRAY(arena, type, old, old_size, new_size) \ |
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324 (type*) (arena)->Arealloc((char*)(old), (old_size) * sizeof(type), \ |
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325 (new_size) * sizeof(type) ) |
0 | 326 |
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327 #define FREE_ARENA_ARRAY(arena, type, old, size) \ |
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328 (arena)->Afree((char*)(old), (size) * sizeof(type)) |
0 | 329 |
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330 #define NEW_ARENA_OBJ(arena, type) \ |
0 | 331 NEW_ARENA_ARRAY(arena, type, 1) |
332 | |
333 | |
334 //%note allocation_1 | |
335 extern char* resource_allocate_bytes(size_t size); | |
336 extern char* resource_allocate_bytes(Thread* thread, size_t size); | |
337 extern char* resource_reallocate_bytes( char *old, size_t old_size, size_t new_size); | |
338 extern void resource_free_bytes( char *old, size_t size ); | |
339 | |
340 //---------------------------------------------------------------------- | |
341 // Base class for objects allocated in the resource area per default. | |
342 // Optionally, objects may be allocated on the C heap with | |
343 // new(ResourceObj::C_HEAP) Foo(...) or in an Arena with new (&arena) | |
344 // ResourceObj's can be allocated within other objects, but don't use | |
345 // new or delete (allocation_type is unknown). If new is used to allocate, | |
346 // use delete to deallocate. | |
347 class ResourceObj ALLOCATION_SUPER_CLASS_SPEC { | |
348 public: | |
1685 | 349 enum allocation_type { STACK_OR_EMBEDDED = 0, RESOURCE_AREA, C_HEAP, ARENA, allocation_mask = 0x3 }; |
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350 static void set_allocation_type(address res, allocation_type type) NOT_DEBUG_RETURN; |
0 | 351 #ifdef ASSERT |
352 private: | |
1685 | 353 // When this object is allocated on stack the new() operator is not |
354 // called but garbage on stack may look like a valid allocation_type. | |
355 // Store negated 'this' pointer when new() is called to distinguish cases. | |
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356 // Use second array's element for verification value to distinguish garbage. |
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357 uintptr_t _allocation_t[2]; |
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358 bool is_type_set() const; |
0 | 359 public: |
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360 allocation_type get_allocation_type() const; |
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361 bool allocated_on_stack() const { return get_allocation_type() == STACK_OR_EMBEDDED; } |
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362 bool allocated_on_res_area() const { return get_allocation_type() == RESOURCE_AREA; } |
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363 bool allocated_on_C_heap() const { return get_allocation_type() == C_HEAP; } |
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364 bool allocated_on_arena() const { return get_allocation_type() == ARENA; } |
1685 | 365 ResourceObj(); // default construtor |
366 ResourceObj(const ResourceObj& r); // default copy construtor | |
367 ResourceObj& operator=(const ResourceObj& r); // default copy assignment | |
368 ~ResourceObj(); | |
0 | 369 #endif // ASSERT |
370 | |
371 public: | |
372 void* operator new(size_t size, allocation_type type); | |
373 void* operator new(size_t size, Arena *arena) { | |
374 address res = (address)arena->Amalloc(size); | |
1685 | 375 DEBUG_ONLY(set_allocation_type(res, ARENA);) |
0 | 376 return res; |
377 } | |
378 void* operator new(size_t size) { | |
379 address res = (address)resource_allocate_bytes(size); | |
1685 | 380 DEBUG_ONLY(set_allocation_type(res, RESOURCE_AREA);) |
0 | 381 return res; |
382 } | |
383 void operator delete(void* p); | |
384 }; | |
385 | |
386 // One of the following macros must be used when allocating an array | |
387 // or object to determine whether it should reside in the C heap on in | |
388 // the resource area. | |
389 | |
390 #define NEW_RESOURCE_ARRAY(type, size)\ | |
391 (type*) resource_allocate_bytes((size) * sizeof(type)) | |
392 | |
393 #define NEW_RESOURCE_ARRAY_IN_THREAD(thread, type, size)\ | |
394 (type*) resource_allocate_bytes(thread, (size) * sizeof(type)) | |
395 | |
396 #define REALLOC_RESOURCE_ARRAY(type, old, old_size, new_size)\ | |
397 (type*) resource_reallocate_bytes((char*)(old), (old_size) * sizeof(type), (new_size) * sizeof(type) ) | |
398 | |
399 #define FREE_RESOURCE_ARRAY(type, old, size)\ | |
400 resource_free_bytes((char*)(old), (size) * sizeof(type)) | |
401 | |
402 #define FREE_FAST(old)\ | |
403 /* nop */ | |
404 | |
405 #define NEW_RESOURCE_OBJ(type)\ | |
406 NEW_RESOURCE_ARRAY(type, 1) | |
407 | |
408 #define NEW_C_HEAP_ARRAY(type, size)\ | |
409 (type*) (AllocateHeap((size) * sizeof(type), XSTR(type) " in " __FILE__)) | |
410 | |
411 #define REALLOC_C_HEAP_ARRAY(type, old, size)\ | |
412 (type*) (ReallocateHeap((char*)old, (size) * sizeof(type), XSTR(type) " in " __FILE__)) | |
413 | |
414 #define FREE_C_HEAP_ARRAY(type,old) \ | |
415 FreeHeap((char*)(old)) | |
416 | |
417 #define NEW_C_HEAP_OBJ(type)\ | |
418 NEW_C_HEAP_ARRAY(type, 1) | |
419 | |
420 extern bool warn_new_operator; | |
421 | |
422 // for statistics | |
423 #ifndef PRODUCT | |
424 class AllocStats : StackObj { | |
2250 | 425 julong start_mallocs, start_frees; |
426 julong start_malloc_bytes, start_mfree_bytes, start_res_bytes; | |
0 | 427 public: |
428 AllocStats(); | |
429 | |
2250 | 430 julong num_mallocs(); // since creation of receiver |
431 julong alloc_bytes(); | |
432 julong num_frees(); | |
433 julong free_bytes(); | |
434 julong resource_bytes(); | |
0 | 435 void print(); |
436 }; | |
437 #endif | |
438 | |
439 | |
440 //------------------------------ReallocMark--------------------------------- | |
441 // Code which uses REALLOC_RESOURCE_ARRAY should check an associated | |
442 // ReallocMark, which is declared in the same scope as the reallocated | |
443 // pointer. Any operation that could __potentially__ cause a reallocation | |
444 // should check the ReallocMark. | |
445 class ReallocMark: public StackObj { | |
446 protected: | |
447 NOT_PRODUCT(int _nesting;) | |
448 | |
449 public: | |
450 ReallocMark() PRODUCT_RETURN; | |
451 void check() PRODUCT_RETURN; | |
452 }; | |
1972 | 453 |
454 #endif // SHARE_VM_MEMORY_ALLOCATION_HPP |